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采用电子束物理气相沉积技术(EB-PVD)在Rene N5镍基高温合金表面分别制备出N5/NiCrAlY和N5/ZrO_2/NiCrAlY两种涂层体系试样,并对其进行1000℃/5 h和1000℃/350 h高温氧化处理。利用SEM、EDS、XRD等分析方法对比研究了高温环境中镍基合金基体与NiCrAlY粘结层界面的演变行为以及ZrO_2活性扩散障对界面演变的控制作用。结果表明,N5/NiCrAlY体系涂层在高温环境中由于各元素浓度的差异会发生元素互扩散行为,导致在基体/NiCrAlY涂层界面处形成柯肯达尔孔洞,二次反应区及TCP相;而对于N5/ZrO_2/NiCrAlY涂层体系而言,在高温环境中,其ZrO_2活性扩散障将演变为Al_2O_3/Zr-rich/Al_2O_3三层结构,该结构能够有效抑制基体与粘结层之间的元素互扩散行为,阻止二次反应区及TCP相的出现,并且该结构具有良好的高温稳定性能。
N5 / NiCrAlY and N5 / ZrO2 / NiCrAlY coatings were prepared on the surface of Rene N5 nickel base superalloy by electron beam physical vapor deposition (EB-PVD) 1000 ℃ / 350 h high temperature oxidation treatment. The evolution behavior of interface between nickel base alloy and NiCrAlY bonding layer in high temperature environment and the control effect of ZrO_2 active diffusion barrier on interfacial evolution were investigated by SEM, EDS and XRD. The results show that the inter-diffusion of elements occurs in the N5 / NiCrAlY coating at high temperature due to the difference in element concentration, resulting in the formation of Kirkendall holes, secondary reaction zone and TCP phase at the interface of the matrix / NiCrAlY coating. For N5 / ZrO_2 / NiCrAlY coating system, the diffusion barrier of ZrO_2 activity evolves into Al_2O_3 / Zr-rich / Al_2O_3 three-layer structure in high temperature environment. This structure can effectively suppress the interaction between the substrate and the adhesive layer Interdiffusion behavior, to prevent the emergence of secondary reaction zone and TCP phase, and the structure has good high temperature stability.